It occurred to me on a walk that a bias toward seeing everything in terms of systems, so that all problems can only be solved at a systems level is convenient in another way. If something is a system, then all its parts are interrelated and might affect each other. Therefore, if you define something a system, it allows you to intervene absolutely anywhere with at least superficial plausibility.
This is why Congress likes to develop "comprehensive" solutions to everything, rather than finding something wrong and fixing it or finding something right and encouraging it. It allows interventions to multiply endlessly.